Casting steel ingots.



H. H. AS HDOWN.

CASTING STEEL INGOTS.

I APPLICATION FILED JUNE I8, 1917.

1,251,951. muted Jan. 1,1918.

UNITED STATES PATENT OFFICE.

HERBERT HENRY ASHDOWN, 0F NEWCASTLE-UPON-TYNE, ENGLAND, ASSIGNOR TO SIR W. G. ARMSTRONG, WHITWOBTH AND COMPANY, LIMITED, 01' NEWCASTLE- UION'IYNE, ENGLAND.

CASTING STEEL INGOTS.

Specification of Letters Patent.

Patented Jan. 1, 1918.

Application filed June 18, 1917. Serial No. 175,487.

To all whom it may concern:

Be it known that I, HERBERT HENRY ASH- DOWN, a subject of the King of Great Brit-- ain, residing at Elswick Works, Newcastleupon-Tyne, England, have invented a new and useful Improvement in Casting Steel Ingots, ofwhich the following is a specification.

This invention relates to the/casting of ingots and has for itsobject the prevention of segregation of the non-metallic material in the greater part of the bodyof the ingot and of the formation of corner cracks.

According to this invention the sides of the in ot are first cooled until the metal has solidi ed preferably to a considerable thickness, and the ingot is then cooled from its base 11 ward in order to efiect the solidification 0 the still liquid central portion from the base upward. By this process segregation is confined to the top of the ingot.

The castingma take place in any form of mold, but the rawing which is annexed to this specification and which is an'eleva tion partly in section, illustrates a mold suitable for the purpose.

A is a mold having a bottom plate B and in the mold and plate are pi es D for the circulation of the cooling me ium, the supply to the various pipes bein controlled by a series of cocks E. The coo 'n medium is discharged from the pipes D y pipes F.

By 0 ening'the lowest cock E the bottom plate a one is cooled, and similarly any sec-- tion of the mold may be cooled as desired.

In casting the ingot the metal is fed through a feeding head C of usual construction, and in the course of usual working the cocks E are opened in succession upward as the 1i uid metal reaches the part of the mold cooled by each section of pipes.

The efi'ect" 3?- his is to promote a muc quicker solidification of the metal in proximity to the cooled walls of the ingot mold for the entire length of the ingot, causin the segregates to be orced to the center 0 the ingot.

In some cases, especially when very large ingo sare be g as the operation takes a the operation.

consists in pourin the mold becomes hot before the level of the metal gets up to it, and it may be desirable to coo Similarly the cooling effect of the bottom plate and the lowest portion of the mold may be sufficient to solidify the bottom of the ingot without the assistance of the cooling medium, so that it is not always necessary to open the lowest cocks at the commencement of the operation.

Finally after the pouring of the metal is finished the cooling effect of the lowest cooling coil in the wall of the mold and the coil in the bottom plate is increased so that the central portion of the metal which is still liquid is cooled from its bottom end upward forcing the segregates into the last portion remaining liquid near the feeding head. a

What I claim is 1. The process of casting ingots, which consists in pouring the ingot, subjecting the same to an advancing cooling actioncorresponding to the advancingdfgmation of said ingot, and after completion, again submitting the ingot to a further cooling action.

2. The process of -casting ingots, which consists in pouring the ingots, and during the pouring action subjecting the successive accretions to a correspondingly advancing cooling action. 4

3. The process of casting ingots which the ingot, during the pouring action sub ecting the successive accretions to a corres ondingly advancin cooling action, and a or the completion 0 the ingot again subjecting said in 0t toan additional cooling action extending from one end toward the other. 4. The process of casting ingots, which :consists in pouring the metal into a mold,

this portion of the mold early insubjecting the mold to a 0001' action during the pouring operation, sai coolin action being advanced along the mold as the filling takes place, and afterward again subjecting the mold to a cooling action that advances from the bottom toward the top.

In testimony that I claim the foregoing' as my invention I have signed my name this 25th, day of May 1917.

HERBERT HENRY ASHDOWN.

Witnesses:

H. NIXON, A. MITCHINSON. 

